Đề thi Violympic Giải toán trên mạng - Đề thi Tiếng Anh IOE Online Lesson Plans for Teaching in Grade 8 - Bai giang dien tu Lop 8 English - Math Test for Primary School - De thi Giai toan - Tieng Anh tren mang
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Lesson Plans for Teaching in Grade 8 - Bai giang dien tu Lop 8
E -learning Math grade 8 Rectangle PDF Print

E -learning Math grade 8 Rectangle Opposite sides are parallel and congruent Adjust the rectangle above and satisfy yourself that this is so.
- The diagonals bisect each other
- The diagonals are congruent
- Other ways to think about rectangles
- A rectangle can be thought about in other ways:
A square is a special case of a rectangle where all four sides are the same length. Adjust the rectangle above to create a square.
It is also a special case of a parallelogram but with extra limitation that the angles are fixed at 90°. See Parallelogram definition and adjust the parallelogram to create a rectangle.

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E - learning Math grade 8 Parallelogram PDF Print

E -learning Math grade 8 Parallelogram Parallelogram  4-sided flat shape with straight sides where opposite sides are parallel.
A quadrilateral is a parallelogram if:
Both pairs of opposite sides are parallel. (By definition). Or:
Both pairs of opposite sides are congruent. If they are congruent, they must also be parallel. Or:
One pair of opposite sides are congruent and parallel. Then, the other pair must also be parallel.
Also:
* opposite sides are equal in length, and
* opposite angles are equal (angles "a" are the same, and angles "b" are the same)
NOTE: Squares, Rectangles and Rhombuses are all Parallelograms!

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